The utility model provides an evaporation device for vacuum kerosene vapor-phase drying of a transformer. The evaporation device comprises at least two evaporators which are communicated with each other, and each of the evaporators comprises an enclosed casing, a plurality of supports, a heating pipe array and spraying pipes. An evaporating chamber is arranged inside the enclosed casing, a vapor outlet is arranged on the enclosed casing and used for delivering kerosene vapor to the transformer, the supports are vertically fixed in the evaporating chamber, each support is provided with a plurality of round holes, the heating pipe array comprises a plurality of heating pipes which are sleeved into round holes with the circle centers of the same height and used for heating through heat transfer oil, the spraying pipes are arranged above the heating pipe array and sleeved in the round holes with the circle centers of the same height and penetrate through the enclosed casing, and a plurality of small holes are arranged on outer walls of the spraying pipes and used for spraying kerosene to the heating pipe array. The evaporation device can be used for realizing vacuum kerosene vapor-phase drying of the transformer on the spot.